/Engine/Source/Runtime/Engine/Classes/Animation/AnimCompress.h
This is a version string that mimics the old versioning scheme. If you want to bump this version, generate a new guid using VS->Tools->Create GUID and return it here. Ex.
namespace UE { namespace Anim { namespace Compression { static UE::Anim::Compression::AnimationCompressionVersionString = TEXT("55AC7D7DCC1F46C2A8B121A56FA37296"); } } }